CN108016026B - Forming method of HDPE double-wall winding pipe - Google Patents
Forming method of HDPE double-wall winding pipe Download PDFInfo
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- 238000001125 extrusion Methods 0.000 claims abstract description 22
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- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 5
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
- B29C53/56—Winding and joining, e.g. winding spirally
- B29C53/566—Winding and joining, e.g. winding spirally for making tubular articles followed by compression
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
- B29C53/56—Winding and joining, e.g. winding spirally
- B29C53/58—Winding and joining, e.g. winding spirally helically
- B29C53/581—Winding and joining, e.g. winding spirally helically using sheets or strips consisting principally of plastics material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
- B29C53/56—Winding and joining, e.g. winding spirally
- B29C53/58—Winding and joining, e.g. winding spirally helically
- B29C53/60—Winding and joining, e.g. winding spirally helically using internal forming surfaces, e.g. mandrels
- B29C53/62—Winding and joining, e.g. winding spirally helically using internal forming surfaces, e.g. mandrels rotatable about the winding axis
- B29C53/64—Winding and joining, e.g. winding spirally helically using internal forming surfaces, e.g. mandrels rotatable about the winding axis and moving axially
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
- B29C53/80—Component parts, details or accessories; Auxiliary operations
- B29C53/84—Heating or cooling
- B29C53/845—Heating or cooling especially adapted for winding and joining
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The invention discloses a molding method of an HDPE double-wall winding pipe, which comprises the steps of material proportioning, plasticizing extrusion, winding, cooling, shaping cutting, demolding and the like. The invention improves the winding process: the cylindrical steel die rotates and moves horizontally, the steel die is continuously heated by flame, when the temperature reaches 125-135 ℃, the belt-shaped inner material starts to be wound on the steel die, the inner material rotates and presses 1/3-1/2 parts of a circle every week, then the hollow cylindrical outer material is wound on the inner material, the outer material presses 2/3-1/2 parts which are not overlapped, the flame, the inner wall material and the outer wall material of the winding pipe keep the positions unchanged, and the linear speed of the rotation of the steel die is greater than the extrusion rate and is about 1-3%; the performance of the material is greatly enhanced, and the ring rigidity of the winding pipe is improved. Repeated practice proves that the ring stiffness of the HDPE double-wall winding pipe can be improved by 15-20% by the forming method.
Description
Technical Field
The invention relates to the technical field of winding pipes, in particular to a forming method of an HDPE double-wall winding pipe.
Background
The buried drainage pipeline is mainly applied to the fields of large-scale pollution discharge, exhaust, ventilation of subways, tunnels, mines and the like, low-pressure irrigation of farmlands and the like, has low requirement on the internal pressure bearing capacity of the pipeline, but has higher external pressure resistance. The plastic pipeline is low in ring rigidity and poor in external pressure resistance, so that the pipe is often buckled and deformed due to overlarge external pressure load, and certain limitation is brought to plastic underground drainage pipelines applied to large and medium-sized cities. The ring stiffness is a comprehensive parameter of the external pressure load resistance of the plastic buried drain pipe, and the numerical index of the ring stiffness is widely applied internationally to express the external pressure load resistance of the plastic buried drain pipe at present. If the loop stiffness of the tubing is too low, the tubing may deform excessively or buckle destabilization may occur. On the contrary, if the ring stiffness is selected too high, an excessively large section moment of inertia is inevitably adopted, which results in too much material and high cost. Therefore, on the premise of not increasing the manufacturing cost of the pipe, the double-wall wound pipe is invented, compared with a flat-wall pipe, the double-wall wound pipe has higher ring stiffness, strong external pressure load bearing capacity and good comprehensive performance under the condition of the same pipe diameter and sectional area, and mainly adopts High Density Polyethylene (HDPE) and rigid polyvinyl chloride (PVC-U) as main raw materials.
Under the condition of the same diameter, the double-wall winding pipe has the characteristics of light weight and high ring stiffness compared with a PE solid-wall pipeline, and the double-wall winding pipe becomes a mainstream product of a municipal large-caliber drainage and pollution discharge pipeline. The PE material has the advantages of good low-temperature impact resistance and high flexibility, but because the double-wall winding pipe has higher requirement on the ring rigidity of the pipe, the application of the PE material in the production of the double-wall winding pipe is limited by the defects of low modulus, insufficient strength and rigidity of the PE material, and therefore, the improvement of the rigidity of the HDPE double-wall winding pipe under the existing conditions becomes an urgent requirement.
The conventional double-wall winding pipe is mainly formed naturally by a mold, for example, in chinese patent CN 106084449A, the forming method is that a plasticized raw material extruded by an extruder for extruding the inner and outer walls of the double-wall winding pipe is shaped by a double-wall winding pipe shaping mold, and after cooling, the HDPE double-wall winding pipe is obtained, and the method is simply shaped by plasticizing the raw material and then entering the mold; the Chinese patent CN 106009756A discloses a forming method which comprises the following steps: placing the metal net-shaped cylinder in a mould cavity, pouring the raw material melt into the mould cavity, and cooling to form a winding pipe; the two forming methods of the winding pipe can not optimize the performance of the existing material, so that the performance of the winding pipe can be improved only by changing the raw materials of the material formula or increasing the used materials, and the cost is improved.
Disclosure of Invention
The invention aims to provide a forming method of an HDPE double-wall winding pipe, which can save batching cost and improve the ring stiffness of the winding pipe.
In order to achieve the purpose, the invention provides the following technical scheme: a forming method of an HDPE double-wall winding pipe comprises the following steps:
a. preparing materials: uniformly mixing raw materials wound on the inner wall of the pipe, namely raw materials of the inner material; uniformly mixing raw materials of the outer wall of the winding pipe, namely raw materials of the outer material;
b. plasticizing and extruding: plasticizing the inner material by an extruder, extruding the inner material in a belt shape, and extruding the inner material into a heat preservation device; plasticizing the external material by an extruder, extruding the external material in a hollow cylindrical shape, and extruding the external material into a heat preservation device;
c. winding: the cylindrical steel die rotates and moves horizontally, the steel die is continuously heated by flame, when the temperature reaches 125-135 ℃, the belt-shaped inner material starts to be wound on the steel die, the inner material rotates and presses 1/3-1/2 parts of a circle every week, then the hollow cylindrical outer material is wound on the inner material, the outer material presses 2/3-1/2 parts which are not overlapped, the flame, the inner wall material and the outer wall material of the winding pipe keep the positions unchanged, and the linear speed of the rotation of the steel die is greater than the extrusion rate and is about 1-3%;
d. and (3) cooling: continuously blowing cold air to the winding pipe on the steel die by a fan at the wound end of the winding pipe, and continuously blowing cold air to the hollow part of the steel die;
e. shaping and cutting;
f. and (6) demolding.
Compared with the prior art, the winding process is improved: the cylindrical steel die rotates and moves horizontally, the steel die is continuously heated by flame, when the temperature reaches 125-135 ℃, the belt-shaped inner material starts to be wound on the steel die, the inner material rotates and presses 1/3-1/2 parts of a circle every week, then the hollow cylindrical outer material is wound on the inner material, the outer material presses 2/3-1/2 parts which are not overlapped, the flame, the inner wall material and the outer wall material of the winding pipe keep the positions unchanged, and the linear speed of the rotation of the steel die is greater than the extrusion rate and is about 1-3%; the performance of the material is greatly enhanced, and the ring rigidity of the winding pipe is improved. After the plasticizing extrusion process and before the winding process, a heat preservation device is arranged, so that the flexibility of the inner material and the flexibility of the outer material in the winding process are fully ensured, and the change of the inner material and the outer material caused by the external temperature is avoided; repeated practice proves that the ring stiffness of the HDPE double-wall winding pipe can be improved by 15-20% by the forming method.
Further, in the step a, the inner material and the outer material are uniformly mixed, preheated at 110 ℃ for 1 hour and then enter the step b. The preheated inner material and the preheated outer material can improve the ductility, and are beneficial to the subsequent plasticizing extrusion step.
Further, in the step b, the extrusion operating temperature of the inner material and the outer material is 200-210 ℃, and the temperature enhances the bonding performance of the subsequent winding process.
Further, in the step c, the speed of the cylindrical steel mold rotating is 6800-7200 mm/min.
Further, in the step c, the horizontal movement speed of the cylindrical steel die is 800-1100 mm/min.
Further, in the step d, the temperature of the cold air is 0-30 ℃.
And step e, after shaping and cutting, performing fracture detection, and entering step f after the detection is qualified. The fracture of the winding pipe must be kept straight, otherwise, potential safety hazards can be caused to the subsequent use process.
Further, in the step f, after demolding, the supporting pieces are sleeved at two ends of the winding pipe. The support member is sleeved in order to maintain the shape of the winding pipe, and the support member is used for guaranteeing the subsequent use because the subsequent use needs to sleeve and connect each section of the winding pipe for use.
Further, in the step f, after demolding, polishing the outer wall of the winding pipe, and after polishing, coating the surface of the winding pipe, wherein the polyester coating is formed by mixing polytetrafluoroethylene, polyamide, polyethylene and polyolefin resin, and the thickness of the coating is 0.1-0.5 um. The outer wall of the winding pipe is coated to further increase the strength of the winding pipe and enable the winding pipe to meet more severe conditions.
Drawings
FIG. 1 is a process flow diagram of the method of forming HDPE double-walled pipe wound in accordance with the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A forming method of an HDPE double-wall winding pipe comprises the following steps:
a. preparing materials: uniformly mixing raw materials wound on the inner wall of the pipe, namely raw materials of the inner material; uniformly mixing raw materials of the outer wall of the winding pipe, namely raw materials of the outer material;
b. plasticizing and extruding: plasticizing the inner material by an extruder, extruding the inner material in a belt shape, and extruding the inner material into a heat preservation device; plasticizing the external material by an extruder, extruding the external material in a hollow cylindrical shape, and extruding the external material into a heat preservation device;
c. winding: the method comprises the following steps that a cylindrical steel die rotates and moves horizontally, the rotation speed of the cylindrical steel die is 6800mm/min, the speed of the horizontal movement is 800mm/min, the steel die is continuously heated by flame, when the temperature reaches 125-135 ℃, a belt-shaped inner material starts to be wound on the steel die, the inner material rotates to press 1/3-1/2 parts of a circle, then a hollow cylindrical outer material is wound on the inner material, the outer material presses 2/3-1/2 parts which are not overlapped, the flame, the inner wall material and the outer wall material of the winding pipe keep the positions of the flame, the inner wall material and the outer wall material of the winding pipe still, and the linear speed of the rotation of the steel die is larger than the extrusion rate;
d. and (3) cooling: continuously blowing cold air to the winding pipe on the steel die by a fan at the wound end of the winding pipe, and continuously blowing cold air to the hollow part of the steel die;
e. shaping and cutting;
f. and (6) demolding.
The invention improves the winding process: the method comprises the following steps that a cylindrical steel die rotates and moves horizontally, the rotation speed of the cylindrical steel die is 6800mm/min, the speed of the horizontal movement is 800mm/min, the steel die is continuously heated by flame, when the temperature reaches 125-135 ℃, a belt-shaped inner material starts to be wound on the steel die, the inner material rotates to press 1/3-1/2 parts of a circle, then a hollow cylindrical outer material is wound on the inner material, the outer material presses 2/3-1/2 parts which are not overlapped, the flame, the inner wall material and the outer wall material of the winding pipe keep the positions of the flame, the inner wall material and the outer wall material of the winding pipe still, and the linear speed of the rotation of the steel die is larger than the extrusion rate; the performance of the material is greatly enhanced, and the ring rigidity of the winding pipe is improved. After the plasticizing extrusion process and before the winding process, a heat preservation device is arranged, so that the flexibility of the inner material and the flexibility of the outer material in the winding process are fully ensured, and the change of the inner material and the outer material caused by the external temperature is avoided; repeated practice proves that the ring stiffness of the HDPE double-wall winding pipe is improved by 15% by the forming method.
Example 2
A forming method of an HDPE double-wall winding pipe comprises the following steps:
a. preparing materials: uniformly mixing raw materials wound on the inner wall of the pipe, namely raw materials of the inner material; uniformly mixing raw materials of the outer wall of the winding pipe, namely raw materials of the outer material; preheating at 110 ℃ for 100-;
b. plasticizing and extruding: plasticizing the inner material by an extruder, extruding the inner material in a belt shape, and extruding the inner material into a heat preservation device; plasticizing the external material by an extruder, extruding the external material in a hollow cylindrical shape, and extruding the external material into a heat preservation device; the extrusion operation temperature of the inner material and the outer material is 200-210 ℃, and then the inner material and the outer material enter a heat preservation device, the temperature range of the heat preservation device can be set to 100-200 ℃, and the temperature enhances the bonding performance of the subsequent winding process.
c. Winding: the method comprises the following steps that a cylindrical steel die rotates and moves horizontally, the rotation speed of the cylindrical steel die is 7000mm/min, the speed of the horizontal movement is 1000mm/min, the steel die is continuously heated by flame, when the temperature reaches 125-135 ℃, a belt-shaped inner material starts to be wound on the steel die, the inner material rotates and presses 1/3-1/2 parts of a circle every week, then a hollow cylindrical outer material is wound on the inner material, the outer material presses 2/3-1/2 parts which are not overlapped, the flame, the inner wall material and the outer wall material of the winding pipe keep the positions of the flame and the outer wall material, and the linear speed of the rotation of the steel die is larger than the extrusion rate and is about 1-3%;
d. and (3) cooling: continuously blowing cold air to the winding pipe on the steel die by a fan at the wound end of the winding pipe, and continuously blowing cold air to the hollow part of the steel die;
e. shaping and cutting;
f. and (6) demolding.
The preheating links of the inner material and the outer material are added before the plastic extrusion link, so that the ductility is improved, and the subsequent plasticizing extrusion step is facilitated.
Example 3
A forming method of an HDPE double-wall winding pipe comprises the following steps:
a. preparing materials: uniformly mixing raw materials wound on the inner wall of the pipe, namely raw materials of the inner material; uniformly mixing raw materials of the outer wall of the winding pipe, namely raw materials of the outer material; preheating at 110 ℃ for 100-;
b. plasticizing and extruding: plasticizing the inner material by an extruder, extruding the inner material in a belt shape, and extruding the inner material into a heat preservation device; plasticizing the external material by an extruder, extruding the external material in a hollow cylindrical shape, and extruding the external material into a heat preservation device; the extrusion operation temperature of the inner material and the outer material is 200-210 ℃, and then the inner material and the outer material enter a heat preservation device, the temperature range of the heat preservation device can be set to 100-200 ℃, and the temperature enhances the bonding performance of the subsequent winding process.
c. Winding: the method comprises the following steps that a cylindrical steel die rotates and moves horizontally, the rotation speed of the cylindrical steel die is 7000mm/min, the speed of the horizontal movement is 1000mm/min, the steel die is continuously heated by flame, when the temperature reaches 125-135 ℃, a belt-shaped inner material starts to be wound on the steel die, the inner material rotates and presses 1/3-1/2 parts of a circle every week, then a hollow cylindrical outer material is wound on the inner material, the outer material presses 2/3-1/2 parts which are not overlapped, the flame, the inner wall material and the outer wall material of the winding pipe keep the positions of the flame and the outer wall material, and the linear speed of the rotation of the steel die is larger than the extrusion rate and is about 1-3%;
d. and (3) cooling: continuously blowing cold air to the winding pipe on the steel die by a fan at the wound end of the winding pipe, and continuously blowing cold air to the hollow part of the steel die; the cold air temperature is 20 ℃.
e. Shaping and cutting;
f. and (6) demolding.
The reason for increasing the temperature setting of the cold air on the basis of the embodiment 2 is to make the cooling effect better and to be beneficial to improving the production efficiency.
Example 4
A forming method of an HDPE double-wall winding pipe comprises the following steps:
a. preparing materials: uniformly mixing raw materials wound on the inner wall of the pipe, namely raw materials of the inner material; uniformly mixing raw materials of the outer wall of the winding pipe, namely raw materials of the outer material; preheating at 110 ℃ for 100-;
b. plasticizing and extruding: plasticizing the inner material by an extruder, extruding the inner material in a belt shape, and extruding the inner material into a heat preservation device; plasticizing the external material by an extruder, extruding the external material in a hollow cylindrical shape, and extruding the external material into a heat preservation device; the extrusion operation temperature of the inner material and the outer material is 200-210 ℃, and then the inner material and the outer material enter a heat preservation device, the temperature range of the heat preservation device can be set to 100-200 ℃, and the temperature enhances the bonding performance of the subsequent winding process.
c. Winding: the method comprises the following steps that a cylindrical steel die rotates and moves horizontally, the rotation speed of the cylindrical steel die is 7000mm/min, the speed of the horizontal movement is 1000mm/min, the steel die is continuously heated by flame, when the temperature reaches 125-135 ℃, a belt-shaped inner material starts to be wound on the steel die, the inner material rotates and presses 1/3-1/2 parts of a circle every week, then a hollow cylindrical outer material is wound on the inner material, the outer material presses 2/3-1/2 parts which are not overlapped, the flame, the inner wall material and the outer wall material of the winding pipe keep the positions of the flame and the outer wall material, and the linear speed of the rotation of the steel die is larger than the extrusion rate and is about 1-3%;
d. and (3) cooling: continuously blowing cold air to the winding pipe on the steel die by a fan at the wound end of the winding pipe, and continuously blowing cold air to the hollow part of the steel die; the cold air temperature is 10 ℃.
e. Shaping and cutting;
f. and (6) demolding.
The cooling air temperature was further reduced in addition to example 3, and the time was shortened to accelerate cooling.
Example 5
A forming method of an HDPE double-wall winding pipe comprises the following steps:
a. preparing materials: uniformly mixing raw materials wound on the inner wall of the pipe, namely raw materials of the inner material; uniformly mixing raw materials of the outer wall of the winding pipe, namely raw materials of the outer material; preheating at 110 ℃ for 100-;
b. plasticizing and extruding: plasticizing the inner material by an extruder, extruding the inner material in a belt shape, and extruding the inner material into a heat preservation device; plasticizing the external material by an extruder, extruding the external material in a hollow cylindrical shape, and extruding the external material into a heat preservation device; the extrusion operation temperature of the inner material and the outer material is 200-210 ℃, and then the inner material and the outer material enter a heat preservation device, the temperature range of the heat preservation device can be set to 100-200 ℃, and the temperature enhances the bonding performance of the subsequent winding process.
c. Winding: the method comprises the following steps that a cylindrical steel die rotates and moves horizontally, the rotation speed of the cylindrical steel die is 7000mm/min, the speed of the horizontal movement is 1000mm/min, the steel die is continuously heated by flame, when the temperature reaches 125-135 ℃, a belt-shaped inner material starts to be wound on the steel die, the inner material rotates and presses 1/3-1/2 parts of a circle every week, then a hollow cylindrical outer material is wound on the inner material, the outer material presses 2/3-1/2 parts which are not overlapped, the flame, the inner wall material and the outer wall material of the winding pipe keep the positions of the flame and the outer wall material, and the linear speed of the rotation of the steel die is larger than the extrusion rate and is about 1-3%;
d. and (3) cooling: continuously blowing cold air to the winding pipe on the steel die by a fan at the wound end of the winding pipe, and continuously blowing cold air to the hollow part of the steel die; the cold air temperature is 10 ℃.
e. Shaping and cutting; and f, detecting the fracture after the cutting is finished, and entering the step f after the detection is qualified. The fracture of the winding pipe must be kept straight, otherwise, potential safety hazards can be caused to the subsequent use process.
f. And (6) demolding.
The fracture monitoring process is further added on the basis of the embodiment 4, so that the flatness of the fracture of the winding pipe is ensured, and the use safety is improved.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (8)
1. A forming method of an HDPE double-wall winding pipe is characterized by comprising the following steps:
a. preparing materials: uniformly mixing raw materials wound on the inner wall of the pipe, namely raw materials of the inner material; uniformly mixing raw materials of the outer wall of the winding pipe, namely raw materials of the outer material;
b. plasticizing and extruding: plasticizing the inner material by an extruder, extruding the inner material in a belt shape, and extruding the inner material into a heat preservation device; plasticizing the external material by an extruder, extruding the external material in a hollow cylindrical shape, and extruding the external material into a heat preservation device;
c. winding: the cylindrical steel die rotates and moves horizontally, the steel die is continuously heated by flame, when the temperature reaches 125-135 ℃, a belt-shaped inner material is wound on the steel die, the inner material rotates to press 1/3-1/2 parts of a circle every week, then a hollow cylindrical outer material is wound on the inner material, the outer material presses 2/3-1/2 parts which are not overlapped, the flame, the inner wall material and the outer wall material of the winding tube keep the positions unchanged, and the linear speed of the rotation of the steel die is greater than the extrusion rate by 1-3%;
d. and (3) cooling: continuously blowing cold air to the winding pipe on the steel die by a fan at the wound end of the winding pipe, and continuously blowing cold air to the hollow part of the steel die;
e. shaping and cutting;
f. demolding;
in the step a, after the inner material and the outer material are uniformly mixed, preheating at the temperature of 100 ℃ and 110 ℃ for 1 hour, and then entering the step b;
and f, after demolding, polishing the outer wall of the winding pipe, and coating the surface of the winding pipe after polishing.
2. The method of claim 1, wherein the HDPE double-wall winding pipe comprises the following steps: in the step b, the extrusion operating temperature of the inner material and the outer material is 200-210 ℃.
3. The method of claim 2, wherein the HDPE double-wall winding pipe comprises the following steps: in the step c, the speed of the cylindrical steel die rotating per se is 6800-7200 mm/min.
4. The method of claim 3, wherein the HDPE double-wall winding pipe comprises the following steps: in the step c, the horizontal movement speed of the cylindrical steel die is 800-.
5. The method of claim 4, wherein the HDPE double-wall winding pipe comprises the following steps: in the step d, the temperature of the cold air is 0-30 ℃.
6. The method of claim 5, wherein the HDPE double-wall winding pipe comprises the following steps: and in the step e, after shaping and cutting, performing fracture detection, and entering the step f after the detection is qualified.
7. The method of claim 6, wherein the HDPE double-wall winding pipe comprises the following steps: and f, after demolding, sleeving the supporting pieces at two ends of the winding pipe.
8. The method of claim 7, wherein the HDPE double-walled winding pipe comprises the following steps: the thickness of the coating is 0.1-0.5 um.
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| CN112092127B (en) * | 2020-09-30 | 2023-10-13 | 浙江鑫宙竹基复合材料科技有限公司 | Bamboo winding pipe rack manufacturing equipment and method |
| CN112679882A (en) * | 2020-12-24 | 2021-04-20 | 天津京通管道科技股份有限公司 | Production method of double-wall corrugated pipe |
| CN113580625A (en) * | 2021-08-02 | 2021-11-02 | 安徽杰蓝特新材料有限公司 | Alloy winding pipe and processing technology thereof |
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| CN103423522B (en) * | 2013-04-23 | 2015-08-26 | 杭州联通管业有限公司 | Large-calibre reinforced type polyethylene spirally enwound structure-wall tubular product and preparation process thereof |
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